Capsule, system and method for preparing a beverage by centrifugation

ABSTRACT

A capsule for preparation of a beverage includes a container and a beverage ingredient contained therein. The container includes a code adapted for being identified or read by external reading means, and the code is arranged on the container to be read while the capsule is rotated around an axis of rotation traversing the capsule.

PRIORITY CLAIM

This application is a continuation of U.S. application Ser. No.13/697,297 filed Nov. 9, 2012, which is a National Stage ofInternational Application No. PCT/EP11/057657 filed May 12, 2011, whichclaims priority to European Patent Application No. 10162741.2 filed May12, 2010 and European Patent Application No. 10169374.5 filed Jul. 13,2010, the entire contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The invention relates to the preparation of a beverage by use of acapsule containing beverage ingredient in a beverage production device.The present invention in particular focuses on the detection of thecapsule.

BACKGROUND ART

The preparation of a beverage by a capsule containing beverageingredient is known. In general, the capsule is inserted in a beverageproduction device, such as a coffee machine, liquid is fed in thecapsule and a beverage is extracted from the capsule under pressure orby gravity.

The preparation of a beverage by using the centrifugation is known. Theprinciple mainly consists in providing beverage ingredient in acontainer of the capsule, feeding liquid in the receptacle and rotatingthe receptacle at elevated speed to ensure interaction of liquid withpowder while creating a gradient of pressure of liquid in thereceptacle; such pressure increasing gradually from the centre towardsthe periphery of the receptacle. As liquid traverses the coffee bed,extraction of the coffee compounds takes place and a liquid extract isobtained that flows out at the periphery of the receptacle.

The term “capsule” refers to any flexible, rigid or semi-rigid containercontaining beverage ingredient. Other synonymous to a capsule are:“pod”, “pad”, “cartridge” or “sachet”. The capsule can be single use.The container can also be filled with ingredient by the user to form thecapsule just before use.

The term ingredient means any suitable beverage substance such as groundcoffee, soluble coffee, leaf tea, soluble tea, herbal tea, dairy powder,baby food, culinary powder and combination thereof.

The invention relates more particularly to the identification of thecapsule by means of a code. The code may be necessary to controlparameters in the beverage preparation device such as liquid or beverageflow rate, pressure, rotational speed, temperature and combinationsthereof.

EP045 1980 relates to packages containing comestibles for thepreparation of beverages. Recognition means can comprise one or morestrips of a magnetic material applied to the body of the package whichcan be read by an appropriate magnetic sensor, one or more shaped ordivided areas of metal foil applied to the package body which cause aninductive effect on movement of the package in the machine, whichinductive effect can be sensed; or one or more electrically conductiveareas formed on the body of the package which can be sensedelectrically.

WO02/28241 relates to an encoded coffee packet for use in thepreparation of hot or cold beverages comprising a filter defining acavity and a brewing ingredient within the cavity. The packet furthercomprises a machine-interpretable feature located on the filter such asa color, a shape, a glyph, a text string, a barcode or a digitalwatermark.

WO02/078498 relates to a machine-readable identifier on a portionpackage which contains ground coffee for espresso machine. Theidentifier can be a concentric barcode which is read when the capsuleturns around an axis which is placed outside of its perimeter such aswhen the capsule is stored in a carousel.

WO2005044067 relates to a system for identifying a capsule having a codevisible under UV light printed thereon or a magnetic code such as aribbon or label. The code may be read by a turning magnetic readinghead. However, such system is not adapted for detecting a capsule in adevice using centrifugal forces for extracting the beverage.

WO2009007292 relates to a method for reading barcodes in a drinksmachine when the brewing chamber is being closed from an open positionto a closed position.

WO2010/026053 relates to a controlled beverage production device usingcentrifugal forces. The capsule may comprise a barcode provided on anoutside face of the capsule and which enables a detection of the type ofcapsule and/or the nature of ingredients provided within the capsule inorder to apply a predefined extraction profile for the beverage to beprepared.

A problem with identifying a capsule in a beverage preparation machineis that the retrieving or reading information from the capsule is notalways reliable or convenient. The present invention brings a solutionto this problem.

BRIEF DESCRIPTION

The aim of the present invention is to propose an improved way toidentify the capsule within a beverage production machine to ensure amore reliable and convenient retrieval or reading of information so asto adjust working parameters of the machine.

This aim is achieved by a capsule for the preparation of a beveragecomprising a container and a beverage ingredient contained therein,wherein the container comprises a code adapted for being identified orread by external reading means, wherein the code is arranged on thecontainer to be read while the capsule is rotated around an axis ofrotation traversing the capsule.

More particularly, the capsule has a circumference wherein the code isarranged on the container along an arc-shaped or circular path of thecircumference. In a particular mode, the capsule has a circumferencewherein the code comprises successive segments which are individuallyrectilinear but extend substantially along at least a part of thecircumference. More particularly, the code is arranged along at least aeighth of the circumference. This configuration provides a reliablereading or retrieval of information as well as an effective portion forinformation. In order to ensure a reliable reading or retrieval ofinformation, the code is repeated along said circumference. Therepetition ensures a higher probability that at least one code isreadable but also may potentially reduce the reading time.

Preferably, the code is an optical code. The code may be a bit codeformed by a series of discrete polygonal (e.g., rectangles or squares)or dot surfaces printed on the container and/or embossed in thecontainer.

The code may printed by a visible ink by human eyes under natural lightor, alternatively, an ink which is not visible by human eyes undernatural light (e.g., ink visible under UV).

Preferably, the code is printed or embossed to form a pattern whichpossesses surfaces having different reflective and/or absorbingproperties to light. In particular, the pattern possesses first surfacesand second surfaces having different reflective and/or absorbingproperties to light. More particularly, the pattern possesses firstsurfaces inclined mirroring or absorbing properties to light and secondsurfaces having flat mirroring or flat reflective properties to light.

In a possible mode, the code is mechanically embossed or engraved on thecontainer by laser or by other means such as a press.

In an embodiment, the container comprises a body and a lid connected tothe body and wherein the code is present on the lid of the container.The lid may be a closed foil and/or a filter, for example.

In another embodiment, the code is present on the rim of the capsule. Inthe most preferred embodiment, the code is present on the bottom of therim of the capsule which is opposed to the lid of the capsule. Thebottom of the rim is sufficiently away from the liquid injection andbeverage delivery areas so that there is a lower risk for the code tobecome unreadable such if partly or totally hidden or soiled by beverageresidues or otherwise (e.g., coffee particles). As a result, the readingis made more reliable. The reading may also be carried out while thecapsule is in place in the beverage production device. Therefore, thepreparation of the beverage is simplified and the preparation time canbe reduced.

The invention further relates to a system for preparing a beverage froma capsule as aforementioned and further comprising a beveragepreparation device; wherein the device comprises capsule holding meansfor holding the capsule and rotational drive means for driving theholding means and capsule in rotation along said axis of rotation andreading means arranged for reading the code when the capsule is rotatedalong said axis.

In particular, the reading means may comprise a light emitter and alight sensor. In an alternative, the reading means comprises aninductive sensor. The optical reading means or inductive sensor may bearranged to detect a code on the rim of the capsule.

The invention further relates to a method for preparing a beverage froma system comprising a capsule as aforementioned and a beveragepreparation device; wherein the device comprises capsule holding meansfor holding the capsule therein and rotational drive means for drivingthe holding means and capsule in rotation along said axis of rotationand reading means arranged for reading the code when the capsule isrotated along said axis.

The invention is further described in the appended claims and thefollowing detailed description.

BRIEF DESCRIPTION OF THE FIGURES

The present invention will be better understood thanks to the detaileddescription which follows and the accompanying drawings, which are givenas non-limiting examples of embodiments of the invention, namely:

FIG. 1 illustrates the basic principle of the centrifugal extraction,

FIG. 2 illustrates the reading method of a mark on the lid surface ofthe capsule,

FIG. 3 illustrates the reading method of an absence of the mark,

FIG. 4 illustrates an alternate position of the code on the capsule, inparticular, when placed on the underside of the rim of the capsule, andthe capsule fitted into a capsule holder of the extraction device,

FIGS. 5 and 6 illustrate the combination of a laser source and adetector in positive and negative detection, for example, for thealternate position of the code of FIG. 4,

FIG. 7 illustrates the detection of a color code on the capsule, forexample, for the alternate position of the code of FIG. 4.

DETAILED DESCRIPTION

FIG. 1 illustrates an example of a beverage preparation system 1 asdescribed in WO2010/026053 for which the capsule of the invention can beused.

The centrifugal unit 2 comprises a centrifugal cell 3. The cell 3 maycomprise a capsule holder and a capsule received therein. Thecentrifugal unit is connected to driving means 5 such as a rotary motor.The centrifugal unit comprises a collecting part and an outlet 35. Areceptacle 48 can be disposed below the outlet to collect the extractedbeverage. The system further comprises liquid supply means such as awater reservoir 6 and a fluid circuit 4. Heating means 31 may also beprovided in the reservoir or along the fluid circuit. The liquid supplymeans may further comprise a pump 7 connected to the reservoir. A flowrestriction means 19 is provided to create a restriction to the flow ofthe centrifuged liquid which leaves the capsule. The system may furthercomprise a flow meter such as a flow-metering turbine 8 for providing acontrol of the flow rate of water supplied in the cell 3. The counter 11can be connected to the flow-metering turbine 8 to enable an analysis ofthe generated impulse data 10. The analysed data is then transferred tothe processor 12. Accordingly, the exact actual flow rate of the liquidwithin the fluid circuit 4 can be calculated in real-time. A userinterface 13 may be provided to allow the user to input information thatis transmitted to the control unit 9. Further characteristics of thesystem can be found in WO2010/026053.

In the following examples (see FIG. 4), the capsule comprises acup-shaped body 69 extending by a flange-like rim 73. A lid such as afoil or membrane (liquid-tight or permeable to liquid) 60 is connectedto the body, e.g., sealed on the rim. The body 69 extends from a bottomend of the body 69 to a top end of the body 69 where the body 69terminates such that a height of the body 69 is the distance from thebottom end to the top end, the flange-like rim 73 extends from the topend of the body 69, and the lid 60 has a height that is less than theheight of the body 69. The capsule is filled with beverage ingredientsuch as ground coffee.

The capsule is designed for rotating around an axis A. This axis Acrosses perpendicularly the center of the membrane which has the form ofa disk. This axis A exits at the center of the bottom of the body. Thisaxis A will help to define the notion of “circumference” which is acircular path located on the capsule and having the axis A as referenceaxis. This circumference can be on the lid, e.g., membrane or on thebody part such as on the flange-like rim. The lid may be impervious toliquid before insertion in the device or it may be pervious to liquid bymeans of small openings or pores provided in the center and/or peripheryof the lid.

The code is spread along the circumference or a part of thecircumference. The code may comprise successive arch-shaped segments.The code may also comprise successive segments which are individuallyrectilinear but extend along at least a part of the circumference.According to one embodiment, the sensor cannot read the code without therotation of the capsule. This is the case where the code is spread alongat least a eighth, preferably at least a quarter of the circumference oreven more. The fact that the code is placed along an arc-shaped linerender the reading by a sweep beam very difficult. This is why therotation of the capsule plays an important role. In case that the codeis located on the body, it is then necessary to rotate the capsule tohave access, for the sensor, to the entire set of marks composing thecode. The code is further located close to the peripheral edge of thecapsule. The peripheral edge is defined as the outermost circular lineof the capsule. Preferably, the distance of the code from the peripheraledge is not more than 10 mm, more preferably not more than 8 mm.

According to an embodiment, the code is printed by an ink which is notvisible by human eyes under natural light (e.g., ink visible under 1 V).In this case, the sensor further comprises a UV-light beam source and aUV detector.

The code is preferably repeated along the circumference in order toensure a reliable reading. The code is repeated at least twice on thecircumference. Preferably, the code is repeated three to six times onthe circumference. Repetition of the code means that the same code isduplicated and the successive codes are positioned in series along thecircumference so that upon a 360-degree rotation of the capsule, thesame code can be detected or read more than one time.

EXAMPLES

1) Optical Reading on Foil, Respectively on Top Side Rim of Capsule(FIGS. 2 and 3):

A light beam is projected onto the capsule's lid, e.g., membrane or foil60, as illustrated on FIG. 2.

Onto the capsule foil 60, a plurality of bits forming the code 61 isapplied along a circular or arc-shaped path.

Preferably, the code is placed on a flat portion of the lid and close tothe peripheral edge of the capsule. The code is preferably placed thelid that is supported by the flange-like rim of the capsule or overlapswith the rim. Hence, the code is not distorted due to mechanicalconstraints and can be read more reliably.

The marks may consist of:

-   -   Mirroring or absorbing surfaces for providing bit “0” and,    -   Diffusing and reflective surfaces for providing bit “1”

The binary values “0” and “1” are arbitrary chosen and can be inversed.

The code is read by rotating the capsule along a central axis A (FIG.1).

The reader or sensor 62 is part of the centrifugal unit 2 and consistsof

-   -   A light source with or without focusing optic and    -   A light sensor with or without focusing optic.

The light can be:

-   -   Non polarized or    -   Polarized (laser) or    -   Spectrum: Any, but preferably infra red.

The code can be applied on the capsule by:

-   -   Printing (absorbing/reflecting+diffusing), visible, invisible or    -   Embossing (mirroring+rough reflecting+diffusing) or    -   Laser engraving.

Optionally, the bit code may also consist of different color patternscombined with a color reading device. The combination of differentcolors and reading at a specific rotational speed results in a welldefined “mixed color”. As an example, a capsule with half thecircumference in blue and the other half in yellow would result inreading a green color during rotation. In the same manner, one third inblue and the remaining part in yellow will give another color. In thiscase, the light could be a simple light source without specificconvergence means.

As illustrated in FIG. 2, when the light beam 63, sent by the lightsource of the sensor 62, touches the mirror code pattern (smallrectangles 65) it reflects in a reflective beam 64 which is not receivedby the sensor.

As the capsule is rotated (FIG. 3), the light beam 63 touches a diffusereflecting surface (surface between the small rectangles) and ispartially reflected to the sensor. A reflective beam 66 is received bythe sensor whereas other beams 67, 68 arc diffused or reflected outsidethe sensor.

2) Optical Reading on Rim Bottom Side of Capsule (FIGS. 4 to 7):

The capsule 7 may comprise a code 70 on the bottom side 72 of its rim73. The bit code is formed of a succession of small rectangular surfaceshaving light mirroring properties and intermediate surfaces having flatmirroring and/or diffusing properties. The surfaces are arranged in acircular pattern or an arc-shaped pattern at least along an angularportion of the rim.

A light beam 74 is projected to the capsule's rim 73.

Onto the capsule rim, a bit code is applied along a circular orarc-shaped path of the rim.

The bit code may consist of:

-   -   Inclined mirroring or (flat) absorbing surfaces for bit “0” and    -   Flat mirroring or flat reflective (diffusing) surfaces for bit        “1”

The bit code is read by rotating the capsule along its central axis A.

The reader may consist of

-   -   A light source with/without focusing optic and,    -   A light sensor with/without focusing optic.

The light can be:

-   -   Non polarized or    -   Polarized (laser) or    -   Spectrum: Any, but preferably infra red.

The code can be applied on the capsule by:

-   -   Printing (absorbing/reflecting+diffusing), visible, invisible        or,    -   Laser engraving (e.g. for absorbing/reflecting-diffusing)        surfaces or,    -   Embossing: Flat and inclined mirroring surfaces.

In the embodiment of the FIG. 4, the light source is placed at thebottom of the centrifugal cell 3. This cell is light conductive allowingthe beam to reach the bottom side 72 of its rim 73. The reflected lightis conducted by the transparent (or light conductive) centrifugal cell 3to reach the sensor 62. In case that the sensor 62 cannot be alignedwith the transparent part of the centrifugal cell 3, a mirror can beplaced as illustrated in the FIG. 4 to deflect the forward and backwardbeams.

On FIG. 5, the light beam 74 from the light source “L” touches themirror surface of the code (small rectangle 81) and is reflected into areflective beam 76 to the sensor “S” with high intensity. A bit such as“0” or “1” is thereby provided to the control unit.

On FIG. 6, the light beam 74 from the light source “L” touches diffusingor absorbing surfaces (surface 82 between two small rectangles). Thelight beam 77 that reaches the sensor S is of small intensity. Otherbeams such as beam 78 are diffused outside the sensor S due to thediffusing properties of the surface.

In each configuration (e.g., FIGS. 5-6), a bit such as “1” or “0” isprovided to the control unit.

Therefore, the number of bits and their bit code depend on the numberand specific arrangement of mirror surfaces (e.g. rectangles) anddiffusing or absorbing surfaces (e.g., zones between the rectangles).The same sequence of bits forming a “code” can be repeated several timeson the circumference of the rim. This repetition provides redundancy andmore reliability to the reading.

Optionally (FIG. 7), the code comprises different color patternscombined with a color reading device. The combination of differentcolors and reading at a specific rotational speed results in a welldefined “mixed color”. As an example, a capsule with half the “dots” inblue and the other half in yellow would result in reading a green colorduring rotation.

3) Application Modes of Codes onto a Capsule

The codes described in the previous examples can be applied by differentmethods onto a capsule such as by:

-   -   Printing or mechanical deforming on a formed capsule or,        -   Printing or mechanical deforming on the capsule raw material            (foil) before container forming or,    -   Printing on outer surface of a capsule container or,        -   Printing on the inner surface of a capsule container, using            the curl as information support (Aluminum capsule            technology).

4) Inductive Code Reading:

Another mode consists in sensing a code provided on a metallic surfaceof the capsule using an inductive sensor. The code is formed by reliefsor recesses in the metallic surface. For instance, the capsule comprisesa circumferential metal rim which comprises a succession of discreteslots and/or bumps. When the capsule is rotated about its central axis,the rim is moved relative to the sensor such that the slots and/or bumpsare detected. The code can be read on a time base of a CPU of thebeverage preparation device. The maximum rotational speed to read thecode depends on the used sensor and the internal CPU of the device.

5) Other General Characteristics to all Embodiments:

The speed for reading can, for instance, be comprised between 0.1 and1000 rpm.

When reading the code, liquid can already be fed in the capsule forproviding a pre-wetting of the beverage ingredients.

The code preferably comprises three sections, the synchronizationsection, the payload section and the verification section. Thesynchronization section serves for the synchronization purpose i.e. toinform the sensor when the code begins. Since the speed of the rotationof the capsule can vary, the synchronization is achieved through a knownsequence of bits such as 0,1,0,1. Then the payload of the codeidentifying the capsule can be read. In order to avoid misinterpretationof the code, the payload can be followed by verification bits. Thesebits can be a checksum on the payload or a similar verificationfunction.

The code can be replicated along the code path so that if one code givesa wrong verification value, the other code(s) can be taken into account.

The invention is claimed as follows:
 1. A capsule for preparation of abeverage, the capsule comprising a container and a beverage ingredientcontained therein, wherein the container comprises a code adapted forbeing identified or read by external reading means, wherein the code isarranged on the container to be read while the capsule is rotated aroundan axis of rotation traversing the capsule.
 2. The capsule according toclaim 1, having a circumference wherein the code is arranged on thecontainer along an arc-shaped or circular path of the circumference. 3.The capsule according to claim 1, having a circumference wherein thecode comprises successive segments which are individually rectilinearbut extend substantially along at least a part of the circumference. 4.The capsule according to claim 2 or 3, wherein the code is arrangedalong at least a eighth of the circumference.
 5. The capsule accordingto any of claims 2 to 4, wherein the code is repeated along saidcircumference.
 6. The capsule according to any of the preceding claims,wherein the code is a bit code formed by a series of discrete polygonal(e.g., rectangles or squares) or dot surfaces printed on and/or embossedin the container.
 7. The capsule according to any of claims 1 to 5,wherein the code is printed by an ink which is not visible by human eyesunder natural light (e.g., ink visible under UV).
 8. The capsuleaccording to any of claims 1 to 5, wherein the code is printed orembossed by a pattern which possesses surfaces having differentreflective and/or absorbing properties to light.
 9. The capsuleaccording to claim 8, wherein the pattern possesses first surfaceshaving inclined mirroring or absorbing properties to light and secondsurfaces having flat mirroring or flat reflective properties to light.10. The capsule according to claim 1, wherein the code is mechanicallyembossed or engraved on the container by laser.
 11. The capsuleaccording to claim 1, wherein the container comprises a body and a lidconnected to the body and wherein the code is present on the lid of thecontainer.
 12. The capsule according to claim 1, wherein the code ispresent on the rim of the capsule.
 13. The capsule according to claim12, wherein the code is present on the bottom of the rim of the capsule,which is opposed to the lid or foil of the capsule.
 14. A system forpreparing a beverage from the capsule of claim 1, the system comprisingthe capsule and further comprising a beverage preparation device,wherein the device comprises: capsule holding means for holding thecapsule; rotational drive means for driving the holding means and thecapsule in rotation along an axis of rotation; and reading meansarranged for reading the code when the capsule is rotated along the axisof rotation.
 15. The system according to claim 14, wherein the readingmeans comprises a light emitter and a light sensor or an inductivesensor.
 16. The system according to claim 14, wherein the opticalreading means or inductive sensor is arranged to detect a code on therim of the capsule.
 17. A method for preparing a beverage from thesystem according to claim 14, the method comprising extracting thebeverage from the capsule by rotating the capsule along the axis. 18.The method according to claim 17, wherein the code is read at a firstrotational speed, and the beverage is extracted from the capsule at asecond rotational speed.